18935480

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{109}}^1$

素因数の和:264

約数の個数: 64

約数和(自身を含む): 44431200

約数和(自身を除く): 25495720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 101, 109, 172, 202, 215, 218, 344, 404, 430, 436, 505, 545, 808, 860, 872, 1010, 1090, 1720, 2020, 2180, 4040, 4343, 4360, 4687, 8686, 9374, 11009, 17372, 18748, 21715, 22018, 23435, 34744, 37496, 43430, 44036, 46870, 55045, 86860, 88072, 93740, 110090, 173720, 187480, 220180, 440360, 473387, 946774, 1893548, 2366935, 3787096, 4733870, 9467740, 18935480]

約数ペア:

[(1, 18935480), (2, 9467740), (4, 4733870), (5, 3787096), (8, 2366935), (10, 1893548), (20, 946774), (40, 473387), (43, 440360), (86, 220180), (101, 187480), (109, 173720), (172, 110090), (202, 93740), (215, 88072), (218, 86860), (344, 55045), (404, 46870), (430, 44036), (436, 43430), (505, 37496), (545, 34744), (808, 23435), (860, 22018), (872, 21715), (1010, 18748), (1090, 17372), (1720, 11009), (2020, 9374), (2180, 8686), (4040, 4687), (4343, 4360)]